Re: [EnergyPlus_Support] Detailed Gaylight Calculations

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Daylight Illum at Ref Point reports the illuminance level from daylight only.  
It does not report any illuminance resulting from electric LIGHTS.  EnergyPlus 
does not model the lighting levels produced by electric lighting.  This would 
require more detailed lighting fixture models.

The EnergyPlus daylighting controls assume that the user has specified an 
andequate amount of artificial lighting.  As the illuminance from daylighting 
is sensed at the reference point, the daylighting controls dim the specified 
fraction of the artificial lighting according to the specified control type.

Mike


On 13 Dec 2005, at 12:15, ogocer@xxxxxxxxxxxxxx wrote:

> Dear All,
> Daylight illumination level at reference point seems very high. Although i
> set 500 lux, in output reports it reaches 1500 lux. i specify light
> control type as 3 and i can understand when it reaches 1500 lux even if
> lights are off, i need blind control. But at early hours e.g at 8 o'clock
> daylight illuminance level is under 500 lux. i think it must be 500 lux as
> specified before. i can't understand the reason of it!
> And second question  how can i define the design level of lights in
> internal space gains objects? (assuming there is no daylight and
> illuminance level is achieved by artificial lighting), does excessive
> design level assumption affect daylight illuminance level?
> 
> thanks
> ozgur gocer
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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